import java.net.InetAddress;
import java.net.UnknownHostException;

public class Main {
    public static void main(String[] args) {
        InetAddress pku = null;
        try{
            pku = InetAddress.getByName("www.pku.edu.cn");
        }catch(UnknownHostException e) {}
        byte[] ipAddr =pku.getAddress();
        for(int i=0;i<ipAddr.length;i++) {
            System.out.print(ipAddr[i]);
            System.out.print('.');
        }

    }
}